Abstract
Peg3 is an imprinted gene exclusively expressed from the paternal allele. It encodes a C2H2 type zinc-finger protein and is involved in maternal behavior. It is important for TNF-NFkB signaling and p53-mediated apoptosis. To investigate the imprinting mechanism and gene expression of Peg3 and its neighboring gene(s), we used a 120 kb Peg3-containing BAC clone to generate transgenic mice. The BAC clone contains 20 kb of 5′ and 80 kb of 3′ flanking DNA, and we obtained three transgenic lines. In one of the lines harboring one copy of the transgene, Peg3 was imprinted properly. In the other two lines, Peg3 was expressed upon both maternal and paternal transmission. Imprinted expression was linked to the differential methylation of a region (DMR) upstream of the Peg3 gene. A second, maternally expressed gene, Zim1, present on the transgene was expressed irrespective of parental inheritance in all lines. These data suggest that, similar to other imprinted genes within domains, Peg3 and Zim1 are regulated by one or more elements lying at a distance from the genes. The imprinting of Peg3 seen in one line may reflect the presence of a responder sequence. Concerning the expression of the Peg3 transgene, we detected appropriate expression in the adult brain. However, this was not sufficient to rescue the maternal behavior phenotype seen in Peg3 deficient animals.
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Acknowledgements
We thank Dr. Rosalind John for critical reading of the manuscript, Kathy Hilton for technical assistance, and members of the Surani and McLaren laboratories for their support. I.Y.Y. Szeto was supported by a Cambridge Commonwealth Trust-Shell Scholarship
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Szeto, I.Y., Barton, S.C., Keverne, E. et al. Analysis of imprinted murine Peg3 locus in transgenic mice . Mamm Genome 15, 284–295 (2004). https://doi.org/10.1007/s00335-003-3031-z
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DOI: https://doi.org/10.1007/s00335-003-3031-z